bat
There are a pine apple on the table.
Incorrect.
There is a cucumber in the bowl.
Correct.
She has to go, she is the best on this topic.
Have to/ Correct
They has to study maths.
Incorrect
He is going to the airport.
Correct/ Present Continuous.
We are having a good time.
Correct/ Present Continuous.
You don't need to take the decision now. Think about it.
Correct/ Verb + infinitive.
He decide to apply for the new position.
Incorrect: decides
I'm not playing soccer.
Correct / Present Continuous.
Is you taking a shower?
Incorrect.